prepare prettier auto-formatter

.prettierignore

@@ -0,0 +1,8 @@
+*.html
+.drone.yml
+search*.js
+_normalize.css
+.lighthouseci/
+themes/
+static/js/
+src/favicon/

.prettierrc

@@ -0,0 +1,10 @@
+{
+  "overrides": [
+    {
+      "files": ["*.html"],
+      "options": {
+        "parser": "go-template"
+      }
+    }
+  ]
+}

package-lock.json

@@ -5235,6 +5235,18 @@
       "integrity": "sha512-LmeoohTpp/K4UiyQCwuGWlONxXamGzCMtFxLq4W1nZVGIQLYvMCJx3yAF9qyyuFpflABI9yVdtJAqbihOsCsJQ==",
       "dev": true
     },
+    "prettier": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.1.1.tgz",
+      "integrity": "sha512-9bY+5ZWCfqj3ghYBLxApy2zf6m+NJo5GzmLTpr9FsApsfjriNnS2dahWReHMi7qNPhhHl9SYHJs2cHZLgexNIw==",
+      "dev": true
+    },
+    "prettier-plugin-go-template": {
+      "version": "0.0.10",
+      "resolved": "https://registry.npmjs.org/prettier-plugin-go-template/-/prettier-plugin-go-template-0.0.10.tgz",
+      "integrity": "sha512-TaHPqiMK/zfk+YhvKRf/1WZDgQ6ffnlxJZX5rwphqfxBOVEezZQtYistTB348MKrKnnwKpyXZWpMRo0/KCVB+A==",
+      "dev": true
+    },
     "pretty-hrtime": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/pretty-hrtime/-/pretty-hrtime-1.0.3.tgz",

package.json

@@ -23,6 +23,8 @@
     "gulp-rename": "^2.0.0",
     "gulp-sass": "^4.1.0",
     "gulp-svg-sprite": "^1.5.0",
+    "prettier": "^2.1.1",
+    "prettier-plugin-go-template": "0.0.10",
     "run-sequence": "^2.2.1"
   },
   "browserslist": [